Area spline range · Broken band

Missing pairs retain the gap.

Use smooth interval bands over an ordered X axis. Interpolation retains the original endpoints and never creates sample observations.

Named series with id/x/low/high points. Both bounds must be finite and ordered, or both null. Numeric and UTC-time X must be ordered.

Fixed monotone interpolation, paired gaps, individual/shared endpoint detail, labels, legend and viewport. No stacking, custom curves, markers or point overrides.

• Smooth intervals
• Broken band
• Signed band

• Introduction
• Installation
• Component API
• Touch and selection
• Customization
• Accessibility
• Testing
• Performance
• Status and compatibility
• Ecosystem
• Demos